Update taiki-e/install-action digest to bb5b6ec (#322)

Author: nextest-bot

.github/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Lint (rustfmt)
         run: cargo xfmt --check
       - name: Install cargo readme
-        uses: taiki-e/install-action@c45072658c5d4b46c598b05c54f3d0b541f90bd3 # v2
+        uses: taiki-e/install-action@bb5b6ec0fe226d4254f80ec39794c3a8c1b6525f # v2
         with:
           tool: cargo-readme
       - name: Run cargo readme